Naomi Osaka 7-6 (7-2) 5-7 6-4 Petra Kvitova
Kvitova saves three championship points to force third set
Osaka becomes world number one after winning back-to-back Grand Slam titles
*Kvitova 6-7 (2-7) 3-5 Osaka
What a serve that is, swinging down the T from Naomi Osaka.
She races to a 40-15 lead and she holds thanks to an astonishing swipe that leaves Kvitova sprawling.
Osaka is a game away from her second, successive Grand Slam title.
Kvitova 6-7 (2-7) 3-4 Osaka*
This is going quickly from Kvitova now.
She lets a 0-30 lead slip with a couple of cross-court errors, but she serves and volleys her way to game point.
Kvitova lets out a scream as she sends a backhand winner into the corner of the court.
Jonathan Jurejko
BBC Sport at Melbourne Park
Bang! Whizz! Hiss! Rod Laver Arena isn't the only place in Melbourne where there are fireworks tonight.
In the distance you can hear faint gunpowder explosions as the Australia Day fireworks are let off in the Docklands area - the other side of town.
There was a time when the display happened closer to Melbourne Park, with play memorably having to be stopped once or twice because of the noise.
*Kvitova 6-7 (2-7) 2-4 Osaka
Kim Clijsters
Four-time Grand Slam champion on BBC Radio 5 live sports extra
It's amazing how Osaka has been able to turn this set around.
Image source, Getty Images*Kvitova 6-7 (2-7) 2-4 Osaka
Osaka is a little tense first up, slipping to 0-30, but she's soon level as Kvitova whirls successive forehands long.
Again, the errors come off the Kvitova forehand, and from 0-30 down, Osaka holds with ease.
Kvitova 6-7 (2-7) 2-3 Osaka*
Gigi Salmon
Radio 5 live sports extra tennis commentator at Melbourne Park
Look at Osaka's box. They are standing on their feet and applauding their woman. She has got the third break in the set and leads.
Kvitova 6-7 (2-7) 2-3 Osaka*
Kim Clijsters
Four-time Grand Slam champion on BBC Radio 5 live sports extra
When Osaka was down in the second set she was able to lift her game. She is moving very well and is just a little bit more powerful than Kvitova. This type of Naomi Osaka is very tough to beat.
Kvitova 6-7 (2-7) 2-3 Osaka*
Osaka only needs one!
Big hitting from both players and when Kvitova tries a delicate drop shot, she skews the ball long.
Three games in a row for Osaka.
*Kvitova 6-7 (2-7) 2-2 Osaka
This is relentless from Naomi Osaka.
She's reading Petra Kvitova's serves so well, moving out wide to give herself the best chance of returning, and Kvitova's forehand has broken down.
Three break points for Osaka.
#bbctennis
Anukram Adhikary: Let’s not forget that Petra Kvitova has won more three set matches than any player on the WTA since 2003. If this game goes to three sets, that is...
Zayne Paisley: This is why woman’s tennis should have 5-sets. High quality tennis.
Image source, Getty Images*Kvitova 6-7 (2-7) 2-2 Osaka
Osaka does well to come forward to meet a Kvitova block, but she just pushes her volley long.
Superb from Osaka, swinging down an ace for 30-15, and she holds with a huge backhand into the corner of the court.
Some hitting, this.
Kvitova 6-7 (2-7) 2-1 Osaka*
...Is it bad that I want this to go to three sets, just so we can carry on watching these two play?
Kvitova 6-7 (2-7) 2-1 Osaka*
Oh!
Backhand from Kvitova, but it hits the top of the net - and doesn't clear it!
Osaka breaks back.
Image source, Getty Images*Kvitova 6-7 (2-7) 2-0 Osaka
Oh, ouch.
Kvitova double faults. Break back point, Osaka.
*Kvitova 6-7 (2-7) 2-0 Osaka
One-two punch from Kvitova, and she's in front again...
...whoops. That's, er, a wonky shot from Kvitova, crouched low on her backhand, and we're going back to deuce.
*Kvitova 6-7 (2-7) 2-0 Osaka
And this time Kvitova does go down the T with her first serve.
Advantage, Kvitova - and that's a huge forehand from Osaka! Oh, it's so good.
Deuce.
*Kvitova 6-7 (2-7) 2-0 Osaka
Down the line aims Osaka - and misses!
Oh, that was so, so close! Deuce.
*Kvitova 6-7 (2-7) 2-0 Osaka
Osaka has moved out wide to cover those Kvitova serves, but the Czech isn't really going down the T to try and outmanoeuvre her.
That's a mis-hit from Osaka, but Kvitova larrups her own forehand long! Break back point to Osaka.
*Kvitova 6-7 (2-7) 2-0 Osaka
A frustrated Osaka comes within inches of smashing her racquet on the floor, but she claws her way to 30-30 with an absolute belter of a forehand.
Big point for Kvitova, and she steps in to slash a winner of her own cross-court. Osaka challenges, but she knows it's in - and indeed it is.
40-30 - but it's deuce thanks to a superb, brutal return from Osaka.
Image source, Getty Images*Kvitova 6-7 (2-7) 2-0 Osaka
Kim Clijsters
Four-time Grand Slam champion on BBC Radio 5 live sports extra
It was only a matter of time before she would break. She had a few chances in the first set but wasn't able to finish it off. She's sticking to her gameplan and not letting anything get to her.